Windows代码,添加一个节,以及RVA跟FOA互相转化,以及内存文件对齐代码.

DWORD RetRvaToFoA(DWORD RvaValue)
{
    int RetRvaValue = 0;
    if (RvaValue > pOptHead->ImageBase)
    {
        RetRvaValue = RvaValue - pOptHead->ImageBase;
    }

    //定位节表位置,遍历节表.判断是否在节表内.
    PIMAGE_DOS_HEADER pDosHead = (PIMAGE_DOS_HEADER)(g_szBuffer);  //g_szBuffer是文件映射的首地址.
    PIMAGE_NT_HEADERS pNtHead = (PIMAGE_NT_HEADERS)((DWORD)g_szBuffer + pDosHead->e_lfanew);
    //定位节表.
    PIMAGE_SECTION_HEADER SectionTableAddress = IMAGE_FIRST_SECTION(pNtHead);//获得了节表的首地址
    for (int i = 0; i < pNtHead->FileHeader.NumberOfSections; i++)
    {
        if (RetRvaValue >= SectionTableAddress[i].VirtualAddress  &&
            RetRvaValue < (SectionTableAddress[i].VirtualAddress + SectionTableAddress[i].SizeOfRawData))
        {
            //落在这个节中.
            RetRvaValue = RetRvaValue - SectionTableAddress[i].VirtualAddress; // 文件偏移 -文件偏移首地址 = 偏移. 偏移加上自己的VirtuallAddress 就是在内存中的RVA
            RetRvaValue = RetRvaValue + SectionTableAddress[i].PointerToRawData;
            break;
        }
    }
    return RetRvaValue; //返回FOA在内存中的RVA偏移.
}

DWORD RetFoAtoRva(DWORD FoAvalue)
{
    int RetFoaValue = 0;
    //定位节表位置,遍历节表.判断是否在节表内.
    PIMAGE_DOS_HEADER pDosHead = (PIMAGE_DOS_HEADER)(g_szBuffer);
    PIMAGE_NT_HEADERS pNtHead = (PIMAGE_NT_HEADERS)((DWORD)g_szBuffer + pDosHead->e_lfanew);
    //定位节表.
    PIMAGE_SECTION_HEADER SectionTableAddress = IMAGE_FIRST_SECTION(pNtHead);//获得了节表的首地址
    for (int i = 0; i < pNtHead->FileHeader.NumberOfSections; i++)
    {
        if (FoAvalue >= SectionTableAddress[i].PointerToRawData && FoAvalue < (SectionTableAddress[i].PointerToRawData + SectionTableAddress[i].SizeOfRawData))
        {
            //落在这个节中.
            RetFoaValue = FoAvalue - SectionTableAddress[i].PointerToRawData; // 文件偏移 -文件偏移首地址 = 偏移. 偏移加上自己的VirtuallAddress 就是在内存中的RVA
            RetFoaValue = RetFoaValue + SectionTableAddress[i].VirtualAddress;
            break;
        }
    }
    return RetFoaValue; //返回FOA在内存中的RVA偏移.
}

//传入PE的原始内存对齐值,然后传入你的要进行对齐的值.  
例子:

int RetSectionAlignment(DWORD Alignment, DWORD sizeOfImage)
{
    //if (Alignment <=0)
    //{
    //    AfxMessageBox(_T("计算内存对其值出错.请检查"));
    //    return 0;
    //}
    //while ((sizeOfImage %  Alignment) != 0) //当不等于0就说明不是对齐.
    //{
    //   
    //    sizeOfImage = sizeOfImage + 0x1000;
    //}
    int ret = 0;
    int result = 0;
    result = sizeOfImage % Alignment;
    if (0 != result)
    {
        ret = ((sizeOfImage / Alignment) + 1) * Alignment;
    }
    else
    {
        ret = sizeOfImage;
    }

    return ret;
}

int RetFileAlignment(DWORD Alignment, DWORD Value)
{
    if (Alignment <= 0)
    {
        OutputDebugString(TEXT("计算文件对其值出错.请检查"));
        return 0;
    }
    //while ((Value %  Alignment) != 0) //当不等于0就说明不是对齐.
    //{

    //    Value = Value + Alignment;
    //}
    //return Value;

    int ret = 0;
    int result = 0;
    result = Value % Alignment;
    if (0 != result)
    {
        ret = ((Value / Alignment) + 1) * Alignment;
    }
    else
    {
        ret = Value;
    }

    return ret;

}